It is well known that the factory emulator is extremely slow. The trick here is that the factory emulator must run on an ARM machine, so it needs to convert the ARM calls to your x86 processor calls (or 64 bits). He probably never runs fast. In this situation, you can trust factory x86 images using Intel HAXM drivers that are not available to everyone, and I could not get it to work on my own, but it is useful to know.
But! . Since then I started using Genymotion emulators. They rely on a virtual machine that is much faster than anything a factory emulator can achieve. Even if I run it on the lowest Mac Mini, it's pretty smooth. I will personally try (well, for sure, I tried)
https://www.genymotion.com/
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